首页|Microstructure and magnetocaloric properties of melt-extracted SmGdDyCoAl high-entropy amorphous microwires
Microstructure and magnetocaloric properties of melt-extracted SmGdDyCoAl high-entropy amorphous microwires
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This paper presents a systematic investigation of the microstructure and magnetocaloric properties of melt-extracted Sm20Gd20Dy20Co20Al20 high-entropy microwires.The fabricated wires exhibited an amorphous structure,and the temperature interval of the undercooled liquid ΔT was 45 K.The microwires underwent a second-order magnetic transition from a ferromagnetic to a para-magnetic state near the Curie temperature(Tc=52 K).The maximum magnetic entropy change(-ΔSmaxM),the relative cooling power and the refrigeration capacity reached 6.34 J·kg-1·K-1,422.09 J·kg-1 and 332.94 J·kg-1,respectively,under a magnetic field change of 5 T.In addition,the temperature-averaged entropy changes with two temperature lifts(3 and 10 K)were 6.32 and 6.27 J·kg-1·K-1,respectively.The good magnetocaloric performance highlights the significant potential for the Sm20Gd20Dy20Co20Al20 microwires to be used as magnetic refrigerant materials in low-temperature region applica-tions.This work will serve as a valuable reference for future investigations on low-temperature high-entropy magnetocaloric materials.
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